One option to clear the error is to report your ISO as if it were a regular stock trade. If you know the relevant information to enter, i.e., cost basis, date sold, number of shares sold, sales proceeds, then you can enter that information and produce the same result as if you went through the ISO screens.
Because you know that part of the ISO compensation has already been included on your W-2, you are correct in that you do not want to pay tax twice on the same income. Thus, if you decide to just enter your ISO as a regular stock trade, you can just focus on entering the sales information for the ISO without having to be concerned with the income already included on your W-2.
If you decide to pursue this option, when you have to select the type of investment , don't select ISO, but rather just select Stock (non-employee). That way, you avoid having to deal with any of the issues relating to income already reported on your W-2.
@ca_tax_filer_123
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